Performance of Switch-based Height Measuring System of Laminated Object Manufacturing
Liu Hai-bin · Machine Tool & Hydraulics · 2005
A switch-based height measuring system used in Laminated object manufacturing (LOM) was proposed.The system was composed of a limit switch and a platform driven by a stepper motor.The resolution of the system was decided by the step size of the motor.Repeated measuring experiments were conducted to evaluate the influence of the pulse frequency of the motor and the interval time of measurement on the performance of the system.The results show when the step size is 0.000390625 mm/step,the standard deviation of the system was 0.001mm and the extreme deviation of two serial measured data is no more than 5 steps in the probability of 0.9916.Physical models were fabricated and the error in Z direction is less than 0.2mm,which indicates the proposed low cost system has use value.